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質問 # 45
A customer's internal LAN wants to deploy 802.1X. Due to external conditions, the only way to use it is EAP relay. Which of the following statements about this solution is wrong? (Multiple choice)
- A. Only the device can actively trigger the authentication method
- B. The server and the device use PEAP authentication
- C. Between the client and the device, the EAP message adopts the EAPOL encapsulation format
- D. CHAP authentication is used between the server and the device
正解：A、D
質問 # 46
Which of the following statements about BSR and RP in PIMSM are correct?
- A. There can be only one C-BSR in a PIMSM domain
- B. There can only be one BSR in a PIMSM domain.
- C. There can be only one C-RP in a PIMSM domain.
- D. There can only be one RP in a PIMSM domain.
正解：B
質問 # 47
The customer LAN switches SWA, SWB, SWC, and SWD form the RRPP ring main ring 1. Switch SWD is connected to switches SWB and SWC, but not to switch SWA.
The switch SWD has the following configuration information:
[SWD] rrpp domain 1
[SWD-rrpp-domain 1] ring 1 node-mode transit primary-port gigabitethernet 2/0/1 secondary-port Gigabitethernet 2/0/2 level 0 If switch SWA is the master node of primary ring 1, and if switch SWD port GigabitEtherent2/0/1 fails, what can we learn from the above information?
- A. SWA will send a Link-Down message to notify all nodes
- B. The switch SWC immediately switches to the Failed state and releases the secondary port.
- C. The switch SWA immediately switches to the Failed state and releases the secondary port
- D. If the switch SWD finds that the port GigabitEthernet2/0/1 is Up again, it will immediately unblock the port.
正解：C
質問 # 48
Regarding the working mode of Voice VLAN, which of the following is correct? (Multiple choice)
- A. In manual mode, the system will not send ACL to the port
- B. In automatic mode, the system will identify the message sent by the IP Phone. If it matches the voice message, the port connected to the IP Phone will be added to the Voice VLAN.
- C. In manual mode, you need to manually add IP Phone to Voice VLAN
- D. Voice VLAN has two working modes: automatic and manual.
正解：B、C、D
質問 # 49
Regarding the comparison of BPDU formats between RSTP and STP, which of the following statements are correct? (Multiple choice)
- A. In the RST BPDU, the P/A flag in the Flags field is used for the root port fast switching mechanism
- B. The TCA bit is not used in the topology change process defined by RSTP.
- C. In the RST BPDU, all 8 bits of the Flags field have actual meanings
- D. RSTP does not define a separate BPDU type for the topology change process
正解：B、C、D
質問 # 50
Two routers are connected together through a LAN to form a VRRP backup group. The configuration on each interface is as follows:
[RTA-GigabitEthernet1/0] display this
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
Vrrp vrid 1 priority 120 shut down.
[RTB-GigabitEthernet1/0] display this
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
What can we learn from the above information?
- A. Router RTA is in VRRP Backup state, and router RTB is in VRRP Master state
- B. Router RTA is in VRRP Master state, and router RTB is in VRRP Backup state.
- C. Router RTA is in VRRP Master state, and router RTB is in VRRP Master state.
- D. Router RTA is in VRRP Initialize state, and router RTB is in VRRP Master state
正解：D
質問 # 51
The unicast routing table of the router is as follows:
<H3C>display ip routing-table Routing Tables: Public Destinations: 9Routes: 9 Destination/MaskProtoPreCost NextHop Interface 10.1.1.0/30 Direct 0010.1.1.2 S0/2/0
10.1.1.0/30 Direct 00 10.1.1.2 S0/2/0
10.1.1.1/32 Direct 00 10.1.1.1 S0/2/0
|10.1.1.2/32 Direct 00 127.0.0.1 InLoop 0
11.1.1.0/30 Direct 00 11.1.1.1 Eth0/1/0
11.1.1.1/32 Direct 00 127.0.0.1 InLoop 0
|12.1.1.0/30 Direct 00 12.1.1.1Eth0/1/1
|12.1.1.1/32 Direct 00 127.0.0.1 InLoop 0
13.1.1.0/30 Direct 00 13.1.1.1Eth0/1/2/
13.1.1.1/32 Direct 00 127.0.0.1 InLoop 0
100.1.1.0/240 SPF 10 156310.1.1.1 S0/2/0
127.0.0.0/8 Direct 00 127.0.0.1 InLoop 0
127.0.0.1/32 Direct 00 127.0.0.1 InLoop 0
200.1.1.0/240 SPF 10 212.1.1.2 Eth0/1/1
Then, the multicast data received by the receiver is? (Multiple choice)
- A. (200.1.1.1, 226.2.2.2)
- B. (100.1.1.1, 226.3.3.3)
- C. (100.1.1.1, 226.1.1.1)
正解：A、C
質問 # 52
A router running PIM-DM will periodically send Hello messages to discover neighbors and establish and maintain neighbor relationships. Which of the following descriptions of Hello messages are correct?
(Multiple choice)
- A. When the router runs IGMPV2, it elects a DR for the shared network segment through PIMHello messages, and the DR serves as the Querier of IGMP.
- B. All PIM routers are members of the multicast group 224.0.0.13
- C. If the Hello messages have the same priority, the router with the larger interface IP address will become the DR
- D. When electing a DR, the router with a higher Hello message priority will become the DR
- E. The router sends a PIM Hello in multicast mode, with the destination address being 224.0.0.13
正解：B、C、D、E
質問 # 53
Which of the request operations specified in the SNMP v1 protocol are atomic?
Atomicity means that failure of any variable in the request will cause failure of all variable operations in this request. (Select one or more)
- A. GetNextRequest
- B. GetRequest
- C. There are no atomic operations
- D. SetRequest
正解：B
質問 # 54
In NTP client/server mode, which of the following statements about configuration verification are correct? (Multiple choice)
- A. The client should associate the key with the server to successfully complete the verification.
- B. The authentication of the client and server must be consistent, otherwise the clock synchronization will fail.
- C. When enabling authentication, you must configure both the authentication key and the trusted key.
Otherwise, authentication cannot be started normally. - D. If the client does not enable authentication and the server enables authentication, the client's clock can also be synchronized
正解：A、C
質問 # 55
In the switching network shown in the figure, VLAN10 is set as isolate-user-vlan on switch SWA, VLAN2 and VLAN3 are secondary VLANs of VLAN 10; VLAN2-VLAN20 is created on switch SWB, and VLAN20 is set as isolate-user-vlan, and VLAN4 is the secondary VLA of VLAN20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?
- A. PCA's message comes out of SWA's GigabitEthem1/0/3 port and enters SWB's GigabitEthem1/0/4 port. The VLAN tag it carries is VLAN 10.
- B. The PCA message enters from the GigabitEthem1/0/1 port of SWA and comes out from the GigabitEthem1/0/3 port with the VLAN Tag VLAN 1
- C. SWB's message enters from SWA's GigabitEthem1/0/3 port and leaves from GigabitEthem1/0/1 port with the VLAN tag VLAN10.
- D. When SWB accesses PCA, the message from SWB's GigabitEth1/0/4 does not carry a VLAN Tag
正解：D
質問 # 56
Regarding the configuration of Isolate-user-vlan and Super VLAN, which of the following descriptions is correct? (Multiple choice)
- A. After the local proxy ARP function is enabled on the Super VLAN interface, hosts in different Sub VLANs can communicate with each other.
- B. Enabling the local proxy ARP function on the isolate-user-vlan interface allows hosts in different secondary VLANs to communicate with each other.
- C. After establishing the mapping relationship between Super VLAN and Sub VLAN, the system will prohibit adding/deleting ports to Sub VLAN and deleting VLANs.Operation
- D. After establishing the mapping relationship between Isolate-user-vlan and Secondary VLAN, the system will prohibit the operation of adding/deleting ports to Secondary VLAN and deleting VLAN.
正解：A、D
質問 # 57
In the switching network shown in the figure, VLAN10 is set as Isolate-user-vlan on switch SWA, VLAN2 and VLAN3 are set as Secondary VLAN of VLAN 10; VLAN4 and VLAN20 are created on switch SWB, and VLAN20 is set as Isolate-user-vlan, and VLAN4 is set as Secondary VLA of VLAN20. After setting the IP addresses of each device as shown in the figure, if the local proxy ARP function is enabled on SWA and SWB, and SWA and SWB are allowed to send ICMP packets, then execute the command tracert 10.1.1.2 on PCA, and PCA will display the jumps required to reach PCB ()
正解：
解説：
2
質問 # 58
Which of the following statements is correct about the basic concept of MSTP? (Multiple choice)
- A. IST is a spanning tree in the MST region. The instance number corresponding to IST is 0.
- B. CST refers to a spanning tree between regions, which is obtained by running STP/RSTP between MST regions.
- C. When CST is running, the MST region is regarded as a logical switch, and the root bridge of CST is the region to which the total root belongs.
- D. By default, all VLANs in the MST region are mapped to the IST
正解：A、B、C、D
質問 # 59
In the switching network shown in the figure, VLAN10 is set as Isolate -user- vlan on switch SWA, VLAN2 and VLAN3 are set as Secondary VLAN of VLAN 10; VLAN2 and VLAN20 are created on switch SWB, and VLAN20 is set as Isolate-user-vlan, and VLAN4 is set as Secondary VLAN of VLAN20. After setting the IP addresses of each device as shown in the figure, check the MAC address table on SWA, and you can judge that PCA belongs to _ ______.
- A. VLAN 20
- B. VLAN 2
- C. VLAN 3
- D. VLAN 4
- E. VLAN 1
- F. VLAN 10
正解：B
質問 # 60
In the switching network shown in the figure, VLAN 10 is set as the Super VLAN on the switch SWA, and VLAN 2 and VLAN 3 are sub VLANs of VLAN 10. VLAN, port Ethernet1/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2 and VLAN20 are created on switch SWB, port Ethernet1/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. After setting the IP addresses of each device as shown in the figure, it can be determined that which of the following statement is correct?
- A. The PCA message enters from the Ethernet 1/0/1 port of SWA and comes out from the Ethernet 1/0/3 port with the VLAN Tag of VLAN 10.
- B. PCA's message enters from SWA's Ethernet1/0/1 port and exits from Ethernet1/0/3 port with VLAN Tag VLAN 1
- C. PCA's message enters from SWA's Ethernet1/0/1 port and exits from Ethernet1/0/3 port without a tag
- D. The PCA message enters from the Ethernet1/0/1 port of SWA and comes out from the Ethernet1/0/3 port with the VLAN Tag of VLAN2
正解：D
質問 # 61
Which of the following statements about the role of BSR and RP in PIMSM is correct? (Multiple choice)
- A. BSR controls the collection and dissemination of RP information and is the management core of the PIM-SM domain.
- B. RP is the convergence point for multicast receivers to join a multicast group
- C. RP is the transit station for multicast source to forward multicast traffic
- D. If there is no BSR in the PIM-SM domain, RP information cannot be spread, multicast receivers cannot join normally, and multicast traffic cannot be forwarded normally.
正解：A、B、C
質問 # 62
The SSH protocol framework consists of multiple protocols . Which of the following is a correct description of these protocols and their roles in the SSH framework? (Multiple choice)
- A. The transport layer protocol can provide support for server authentication and information integrity
- B. Link layer protocol completes link availability and establishes encrypted channels and logical channels
- C. The user encryption protocol mainly provides data confidentiality support and divides the encrypted information into several logical channels for multiplexing
- D. User authentication protocol completes the client's identity authentication
正解：A、D
質問 # 63
If you need to implement multicast data forwarding in a three-layer network, at least configure which of the following protocols or functions? (Multiple choice)
- A. IGMP protocol
- B. IGMP Snooping function
- C. PIM protocol
- D. BSR Configuration
正解：A、C
質問 # 64
When an IGMPV2 host leaves a multicast group, it sends a Leave Group message. Which of the following statements is correct? (Multiple choice)
- A. The destination address of the Leave message is the same as the Group Address in the message
- B. The query router sends a specific group query message immediately after receiving the Leave message
- C. Query the router to delete the multicast group table entry of the relevant Group immediately after receiving the Leave message
- D. The destination address of the Leave message is 224.0.0.2
正解：B
質問 # 65
The IP address of host PCA is 40.1.1.1, and the MAC address is 0011.1111.1111. PCA is connected to the GigabitEthernet1/0/1 port of switch SWA. The following commands are configured on switch SWA:
[SWA] vlan 10
[SWA-vlan10] quit
[SWA] vlan 20
[SWA-vlan20] protocol-vlan ipv4
[SWA-vlan20] quit
[SWA] vlan 30
[SWA-vlan30] quit
[SWA] mac-vlan mac-address 0011 1111-1111 vlan 30
[SWA] vlan 40
[SWA-vlan40] ip-subnet-vlan ip 40.1.1.0 255.255.255.0
[SWA-vlan40] quit
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet1/0/1] port link-type hybrid
[SWA-GigabitEthernet1/0/1] port hybrid pvid vlan 10
[SWA-GigabitEthernet1/0/1] port hybrid vlan 10 20 30 40 untagged
[SWA-GigabitEthernet1/0/1] port hybrid protocol-vlan vlan 20 0
[SWA-GigabitEthernet1/0/1] port hybrid ip-subnet-vlan vlan 40
[SWA-GigabitEthernet1/0/1] mac-vlan enable
After the configuration is complete, which of the following can be determined that PCA will join?
- A. VLAN 20
- B. VLAN 30
- C. VLAN 40
- D. VLAN 10
- E. The configuration command is incorrect
正解：B
質問 # 66
The configuration command to enable the QinQ function of the Ethernet port on the H3C series switch is ()
正解：
解説：
qinq enable
質問 # 67
What are the main application directions of SDN at present? (Multiple choice)
- A. Wide Area Network
- B. Campus Network
- C. Local Area Network
- D. Data Center
正解：A、B、D
質問 # 68
Which of the following statements about ring network technology is correct?
- A. The convergence time of RRPP is independent of the number of nodes on the ring network and can be applied to networks with larger network diameters.
- B. RRPP (Rapid Ring Protection Protocol) is a network layer protocol specifically used for Ethernet rings.
- C. RRPR requires dedicated hardware, so the cost is higher
- D. Ethernet ring technology is becoming more mature and low-cost. Technologies to solve the Layer 2 network loop problem include RPR and RRPP.
正解：A
質問 # 69
Which of the following statements about virtual network models are correct? (Multiple choice)
- A. The Router, Network, Firewall, etc. in the OpenStack virtual network model can all be found on VCFC.
- B. The firewall in the OpenStack virtual network model is abstracted and converted by VCFC logic.
- C. When it is mapped to a physical device, it may be a securely managed firewall context or a service chain VFW.
- D. Nova plug-in maps the OpenStack virtual network model to the VCF virtual network model
- E. VCFC abstracts physical network device resources into the logical concept of a virtual network model
正解：A、B、E
質問 # 70
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